Portion of an anti-asphyxia valve for a respiratory mask



FIG. 1 is a front perspective view of a portion of an anti-asphyxia valve for a respiratory mask according to our design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof with the right side view being a mirror image thereof; and,

FIG. 4 is a top view thereof with the bottom view being a mirror image thereof.

The broken lines shown in the drawings represent structural environment are for illustrative purposes only and form no part of the claimed design. The dotted lines represent the border between claimed and non-claimed subject matter and form no part of the claimed design. 

The ornamental design for a portion of an anti-asphyxia valve for a respiratory mask as shown and described. 